Theages was a philosopher who lived in Greece during the 5th century BCE. He is identified as a follower of Pythagoreanism, a school of thought that combined mathematics, philosophy, and a distinctive way of life. Beyond this affiliation, no independent details about his life, origins, or education are known.

His entire historical presence comes from a single source: he appears as a named character in Plato’s famous dialogue, the Republic. In that work, he is listed among the group in the Piraeus who listen to Socrates’ foundational discussion about justice and the ideal state. Theages is not credited with any surviving writings of his own. No treatises or texts authored by him are attested in the historical record.

His significance lies solely in this Platonic mention. His inclusion places him within the broader intellectual circle surrounding Socrates in classical Athens. As a named Pythagorean, his presence has led some scholars to suggest it may subtly indicate Pythagorean influences on certain ideas within the Republic, though this is an interpretive point. Primarily, Theages serves as a minor historical link between Socratic and Pythagorean thought in the late 5th century BCE.